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WHEN Prince Charles and Princess Diana officially separated in 1996, there was plenty of speculation about what had caused their controversial split.

But it now appears that there was one moment that marked the beginning of the end for the couple... and it was all down to a passing comment made by Prince Charles.

 The couple with Prince William and Prince Harry at their home Highgrove House in Tetbury when they were still trying to make their marriage work
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The couple with Prince William and Prince Harry at their home Highgrove House in Tetbury when they were still trying to make their marriage workCredit: Getty - Contributor
Prince Charles described as a 'bad rash' by Princess Diana in Diana: In Her Words

Despite being "very, very close to each other" in the later stages of her second pregnancy, Princess Diana revealed in a 1991 interview that her relationship with Prince Charles "went down the drain" following Harry's birth.

According to Diana's biographer Andrew Morton in his book Diana: Her True Story, she revealed that the first thing her husband said to her when Harry was born was: "Oh God, it's a boy".

But Charles insisted that he was just "joking".

While the royal mother already knew the gender of the baby "because I saw on the scan", Diana deliberately kept it a secret from her husband because he'd always "wanted a girl" and she knew that he would be disappointed.

 According to interviews with Diana, Prince Charles had always wanted a daughter
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According to interviews with Diana, Prince Charles had always wanted a daughterCredit: Getty - Contributor

The late Princess also revealed that Prince Charles moaned to his mother-in-law at Harry's christening and told Frances Shand Kydd that he was "so disappointed - we thought it would be a girl".

Firmly on her daughter's side, Diana's mother apparently then "snapped his head off" and told him how he should "realise how lucky you are to have a child that's normal".

According to the , Prince Charles also told well-wishers in 2014 that he "hoped" Prince William and Kate Middleton's second baby "will be a girl this time".

 Princess Diana described these hurtful comments as what caused her marriage to go 'down the drain'
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Princess Diana described these hurtful comments as what caused her marriage to go 'down the drain'Credit: PA:Press Association
New documentary about Princess Diana includes secret interviews with the Royal never heard before

But this wasn't the only heart-breaking comment Prince Charles made during his first marriage.

Prince Charles also commented on how his youngest son had "even got red hair"  - something which ran in Princess Diana's side of the family.

Although Diana described to Andrew Morton that Prince Harry was a "miracle" and "a complete joy"; who helped her see through "total darkness", she revealed his birth marked the beginning of her marriage to Charles going "down the drain".

But not only this, Diana found that "something inside me closed off" as a result of the hurtful comments and the couple split just a few years later.

 Princess Diana and Prince Charles eventually split in 1995 after 14 years of marriage
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Princess Diana and Prince Charles eventually split in 1995 after 14 years of marriageCredit: Splash News

In more Princess Diana news, this is the reason why Lady Di had a secret second wedding dress... and it was lot less extravagant.

Plus, this is why Princess Diana' sapphire engagement ring was SO controversial at the time.

And the limited-edition Princess Diana Beanie Baby is being sold for £25k on eBay... but how much are they really worth?

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